Host monitoring, in particular for switching between providers, for example.
There is Netwatch, which can send icmp at a specified interval and execute the script when the state is Up and Down.
I already use Netwatch and Telegram notification about the dump of providers. The Netwtch utility has 2 settings: the icmp sending interval and the timeout for how long to wait for a response. In practice, packet loss occurs infrequently and quite often, but it does happen .. due to which “false” responses of netwatch scripts occur and “false” messages periodically come to Telegram about the provider’s dump.
If you use this scheme when reserving providers, there will be periodic “false” switches .. And there are tunnels, ospf … And how does the NAT table feel when switching, are there any suspended sessions that need to be deleted?
The question is: is there no other adequate way to reserve channels in ROS? Maybe they came up with something in the new firmware ??
For example, in Cisco, I have it reserved like this: IPSLA (like Netwatch) which sends icmp to a given host. A track is tied to IPSLA that looks at the SLA state and here is the key point - this track is configured at up / down intervals: for example, go down if ip sla tests fail for 30 seconds, etc.
Plus track can be combined: monitor several ip slas that send icmp to different hosts ..
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